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{{Quantum mechanics|cTopic=[[Interpretation of quantum mechanics|Interpretations]]}}
In [[quantum mechanics]], the '''consistent histories''' approach is intended to give a modern [[interpretation of quantum mechanics]], generalising the conventional [[Copenhagen interpretation]] and providing a natural interpretation of [[quantum cosmology]].<ref>[[Fay Dowker |F. Dowker]] and A. Kent, "Properties of Consistent Histories", Phys. Rev. Lett. 75, 3038 - 3041 (1995)</ref> This interpretation of quantum mechanics is based on a [[consistency]] criterion that then allows probabilities to be assigned to various alternative histories of a system such that the probabilities for each history obey the rules of classical probability while being consistent with the [[Schrödinger equation]]. In contrast to some interpretations of quantum mechanics, particularly the Copenhagen interpretation, the framework does not include "wavefunction collapse" as a relevant description of any physical process, and emphasizes that measurement theory is not a fundamental ingredient of quantum mechanics.
 
==Histories==
 
A ''homogeneous history'' <math>H_i</math> (here <math>i</math> labels different histories) is a sequence of [[Proposition]]s <math>P_{i,j}</math> specified at different moments of time <math>t_{i,j}</math> (here <math>j</math> labels the times). We write this as:
 
<math> H_i = (P_{i,1}, P_{i,2},\ldots,P_{i,n_i}) </math>
 
and read it as "the proposition <math>P_{i,1}</math>  is true at time <math>t_{i,1}</math> ''and then'' the proposition <math>P_{i,2}</math> is true at time <math>t_{i,2}</math> ''and then'' <math>\ldots</math>". The times  <math>t_{i,1} < t_{i,2} < \ldots < t_{i,n_i}</math> are strictly ordered and called the ''temporal support'' of the history.
 
''Inhomogeneous histories'' are multiple-time propositions which cannot be represented by a homogeneous history. An example is the logical [[logical disjunction|OR]] of two homogeneous histories: <math>H_i \or H_j</math>.
 
These propositions can correspond to any set of questions that include all possibilities.
Examples might be the three propositions meaning "the electron went through the left slit", "the electron went through the right slit" and "the electron didn't go through either slit". One of the aims of the theory is to show that classical questions such as, "where are my keys?" are consistent. In this case one might use a large number of propositions each one specifying the location of the keys in some small region of space.
 
Each single-time proposition <math>P_{i,j}</math> can be represented by a [[projection operator]] <math>\hat{P}_{i,j}</math> acting on the system's Hilbert space (we use "hats" to denote operators). It is then useful to represent homogeneous histories by the time-ordered [[tensor product]] of their single-time projection operators. This is the [[history projection operator]] (HPO) formalism developed by [[Christopher Isham]] and
naturally encodes the logical structure of the history propositions. The homogeneous history <math>H_i</math> is represented by the projection operator
 
<math> \hat{H}_i = \hat{P}_{i,1} \otimes \hat{P}_{i,2} \otimes \cdots \otimes \hat{P}_{i,n_i} </math>
 
This definition can be extended to define projection operators that represent inhomogeneous histories too.
 
==Consistency==
 
An important construction in the consistent histories approach is the '''class operator''' for a homogeneous history:
 
:<math>\hat{C}_{H_i} := T \prod_{j=1}^{n_i} \hat{P}_{i,j}(t_{i,j}) = \hat{P}_{i,1}\hat{P}_{i,2}\cdots \hat{P}_{i,n_i}</math>
 
The symbol <math>T</math> indicates that the factors in the product are ordered chronologically according to their values of <math>t_{i,j}</math>: the "past" operators with smaller values of <math>t</math> appear on the right side, and the "future" operators with greater values of <math>t</math> appear on the left side.
This definition can be extended to inhomogeneous histories as well.
 
Central to the consistent histories is the notion of consistency. A set of histories <math>\{ H_i\}</math> is '''consistent''' (or '''strongly consistent''') if
 
:<math>\operatorname{Tr}(\hat{C}_{H_i} \rho \hat{C}^\dagger_{H_j}) = 0</math>
 
for all <math>i \neq j</math>. Here <math>\rho</math> represents the initial [[density matrix]], and the operators are expressed in the [[Heisenberg picture]].
 
The set of histories is '''weakly consistent''' if
:<math>\operatorname{Tr}(\hat{C}_{H_i} \rho \hat{C}^\dagger_{H_j}) \approx 0</math>
 
for all <math>i \neq j</math>.
 
== Probabilities ==
If a set of histories is consistent then probabilities can be assigned to them in a consistent way. We postulate that the [[probability]] of history <math>H_i</math> is simply
 
:<math>\operatorname{Pr}(H_i) = \operatorname{Tr}(\hat{C}_{H_i} \rho \hat{C}^\dagger_{H_i})</math>
 
which obeys the [[axioms of probability]] if the histories <math>H_i</math> come from the same (strongly) consistent set.
 
As an example, this means the probability of "<math>H_i</math> OR <math>H_j</math>" equals the probability of "<math>H_i</math>" plus the probability of "<math>H_j</math>" minus the probability of "<math>H_i</math> AND <math>H_j</math>", and so forth.
 
==Interpretation==
 
The interpretation based on consistent histories is used in combination with the insights about [[quantum decoherence]].  
Quantum decoherence implies that irreversible macroscopic phenomena (hence, all classical measurements) render histories automatically consistent, which allows one to recover classical reasoning and "common sense" when applied to the outcomes of these measurements. More precise analysis of decoherence allows (in principle) a quantitative calculation of the boundary between the classical domain and the quantum domain covariance. According to [[Roland Omnès]],<ref name="Omnès1999">{{cite book |first=Roland |last=Omnès |year=1999 |title=Understanding Quantum Mechanics |publisher=Princeton University Press |isbn=978-0-691-00435-8 |lccn=98042442 |url=http://books.google.com/books?id=8_bnm4qghvkC&lpg=PP179&pg=PA179 |pages=179, 257}}</ref>
{{blockquote|[the] history approach, although it was initially independent of the Copenhagen approach, is in some sense a more elaborate version of it. It has, of course, the advantage of being more precise, of including classical physics, and of providing an explicit logical framework for indisputable proofs. But, when the Copenhagen interpretation is completed by the modern results about correspondence and decoherence, it essentially amounts to the same physics.
 
[... There are] three main differences:
 
1. The logical equivalence between an empirical datum, which is a macroscopic phenomenon, and the result of a measurement, which is a quantum property, becomes clearer in the new approach, whereas it remained mostly tacit and questionable in the Copenhagen formulation.
 
2. There are two apparently distinct notions of probability in the new approach. One is abstract and directed toward logic, whereas the other is empirical and expresses the randomness of measurements. We need to understand their relation and why they coincide with the empirical notion entering into the Copenhagen rules.
 
3. The main difference lies in the meaning of the reduction rule for ‘wave packet collapse’. In the new approach, the rule is valid but no specific effect on the measured object can be held responsible for it. Decoherence in the measuring device is enough.}}
 
In order to obtain a complete theory, the formal rules above must be supplemented with a particular [[Hilbert space]] and rules that govern dynamics, for example a [[Hamiltonian (quantum theory)|Hamiltonian]].
 
In the opinion of others<ref>A. Kent and J. McElwaine ''Quantum Prediction Algorithms'' Phys. Rev. A, 55, 1703--1720 (1997)</ref> this still does not make a complete theory as no predictions are possible about which set of consistent histories will actually occur. That is the rules of Consistent Histories, the [[Hilbert space]], and the Hamiltonian must be supplemented by a set selection rule. However, Griffiths<ref>R. B. Griffiths, ''Consistent Quantum Theory'', Cambridge University Press, 2003</ref> holds the opinion that asking the question of which set of histories will "actually occur" is a misinterpretation of the theory; histories are a tool for description of reality, not separate alternate realities.
 
The proponents of this Consistent Histories interpretation, such as [[Murray Gell-Mann]], [[James Hartle]], [[Roland Omnès]] and [[Robert B. Griffiths]] argue that their interpretation clarifies the fundamental disadvantages of the old Copenhagen interpretation, and can be used as a complete interpretational framework for quantum mechanics. 
 
In ''[[Quantum Philosophy]]'',<ref>R. Omnès, ''[[Quantum Philosophy]]'', Princeton University Press, 1999. See part III, especially Chapter IX</ref> Roland Omnès provides a less mathematical way of understanding  this same formalism.
The consistent histories approach can be interpreted as a way of understanding which sets of classical questions can be consistently asked of a single quantum system, and which sets of questions are fundamentally inconsistent, and thus meaningless when asked together. It thus becomes possible to demonstrate formally why it is that the questions which [[EPR Paradox|Einstein, Podolsky and Rosen]] assumed could be asked together, of a single quantum system, simply cannot be asked together. On the other hand, it also becomes possible to demonstrate that classical, logical reasoning often does apply, even to quantum experiments – but we can now be mathematically exact about the limits of classical logic.
 
==See also==
* [[HPO formalism]]
*[[Physical ontology]]
 
== References ==
<references/>
 
[[Category:Interpretations of quantum mechanics]]
[[Category:Quantum measurement]]

Revision as of 21:57, 1 February 2014

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It's also usually free to tenants. However tenants paying lower than $three,500 monthly in rental typically pay a half month commission for annually of rental. For rentals above $3,500, tenants don't pay any commission. Does the acquisition process differ for residential, retail, office and industrial properties? Our Guide will assist you to have a head begin within the SEARCH ENGINE OPTIMIZATION bandwagon by performing the right WEBSITE POSITIONING implementation with our custom-made WEBSITE POSITIONING ranking tatics. Basic Search Engine Optimization Capacity to add / edit or delete Challenge Change Ordering of Venture Unpublish or Publish a Undertaking Capability to add / edit or delete a banner of the Undertaking I feel what amazes us firstly is that each owner and agent have to be there with us! Month-to-month rent is $3,888 In quantum mechanics, the consistent histories approach is intended to give a modern interpretation of quantum mechanics, generalising the conventional Copenhagen interpretation and providing a natural interpretation of quantum cosmology.[1] This interpretation of quantum mechanics is based on a consistency criterion that then allows probabilities to be assigned to various alternative histories of a system such that the probabilities for each history obey the rules of classical probability while being consistent with the Schrödinger equation. In contrast to some interpretations of quantum mechanics, particularly the Copenhagen interpretation, the framework does not include "wavefunction collapse" as a relevant description of any physical process, and emphasizes that measurement theory is not a fundamental ingredient of quantum mechanics.

Histories

A homogeneous history Hi (here i labels different histories) is a sequence of Propositions Pi,j specified at different moments of time ti,j (here j labels the times). We write this as:

Hi=(Pi,1,Pi,2,,Pi,ni)

and read it as "the proposition Pi,1 is true at time ti,1 and then the proposition Pi,2 is true at time ti,2 and then ". The times ti,1<ti,2<<ti,ni are strictly ordered and called the temporal support of the history.

Inhomogeneous histories are multiple-time propositions which cannot be represented by a homogeneous history. An example is the logical OR of two homogeneous histories: HiHj.

These propositions can correspond to any set of questions that include all possibilities. Examples might be the three propositions meaning "the electron went through the left slit", "the electron went through the right slit" and "the electron didn't go through either slit". One of the aims of the theory is to show that classical questions such as, "where are my keys?" are consistent. In this case one might use a large number of propositions each one specifying the location of the keys in some small region of space.

Each single-time proposition Pi,j can be represented by a projection operator P^i,j acting on the system's Hilbert space (we use "hats" to denote operators). It is then useful to represent homogeneous histories by the time-ordered tensor product of their single-time projection operators. This is the history projection operator (HPO) formalism developed by Christopher Isham and naturally encodes the logical structure of the history propositions. The homogeneous history Hi is represented by the projection operator

H^i=P^i,1P^i,2P^i,ni

This definition can be extended to define projection operators that represent inhomogeneous histories too.

Consistency

An important construction in the consistent histories approach is the class operator for a homogeneous history:

C^Hi:=Tj=1niP^i,j(ti,j)=P^i,1P^i,2P^i,ni

The symbol T indicates that the factors in the product are ordered chronologically according to their values of ti,j: the "past" operators with smaller values of t appear on the right side, and the "future" operators with greater values of t appear on the left side. This definition can be extended to inhomogeneous histories as well.

Central to the consistent histories is the notion of consistency. A set of histories {Hi} is consistent (or strongly consistent) if

Tr(C^HiρC^Hj)=0

for all ij. Here ρ represents the initial density matrix, and the operators are expressed in the Heisenberg picture.

The set of histories is weakly consistent if

Tr(C^HiρC^Hj)0

for all ij.

Probabilities

If a set of histories is consistent then probabilities can be assigned to them in a consistent way. We postulate that the probability of history Hi is simply

Pr(Hi)=Tr(C^HiρC^Hi)

which obeys the axioms of probability if the histories Hi come from the same (strongly) consistent set.

As an example, this means the probability of "Hi OR Hj" equals the probability of "Hi" plus the probability of "Hj" minus the probability of "Hi AND Hj", and so forth.

Interpretation

The interpretation based on consistent histories is used in combination with the insights about quantum decoherence. Quantum decoherence implies that irreversible macroscopic phenomena (hence, all classical measurements) render histories automatically consistent, which allows one to recover classical reasoning and "common sense" when applied to the outcomes of these measurements. More precise analysis of decoherence allows (in principle) a quantitative calculation of the boundary between the classical domain and the quantum domain covariance. According to Roland Omnès,[2] Template:Blockquote

In order to obtain a complete theory, the formal rules above must be supplemented with a particular Hilbert space and rules that govern dynamics, for example a Hamiltonian.

In the opinion of others[3] this still does not make a complete theory as no predictions are possible about which set of consistent histories will actually occur. That is the rules of Consistent Histories, the Hilbert space, and the Hamiltonian must be supplemented by a set selection rule. However, Griffiths[4] holds the opinion that asking the question of which set of histories will "actually occur" is a misinterpretation of the theory; histories are a tool for description of reality, not separate alternate realities.

The proponents of this Consistent Histories interpretation, such as Murray Gell-Mann, James Hartle, Roland Omnès and Robert B. Griffiths argue that their interpretation clarifies the fundamental disadvantages of the old Copenhagen interpretation, and can be used as a complete interpretational framework for quantum mechanics.

In Quantum Philosophy,[5] Roland Omnès provides a less mathematical way of understanding this same formalism. The consistent histories approach can be interpreted as a way of understanding which sets of classical questions can be consistently asked of a single quantum system, and which sets of questions are fundamentally inconsistent, and thus meaningless when asked together. It thus becomes possible to demonstrate formally why it is that the questions which Einstein, Podolsky and Rosen assumed could be asked together, of a single quantum system, simply cannot be asked together. On the other hand, it also becomes possible to demonstrate that classical, logical reasoning often does apply, even to quantum experiments – but we can now be mathematically exact about the limits of classical logic.

See also

References

  1. F. Dowker and A. Kent, "Properties of Consistent Histories", Phys. Rev. Lett. 75, 3038 - 3041 (1995)
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  3. A. Kent and J. McElwaine Quantum Prediction Algorithms Phys. Rev. A, 55, 1703--1720 (1997)
  4. R. B. Griffiths, Consistent Quantum Theory, Cambridge University Press, 2003
  5. R. Omnès, Quantum Philosophy, Princeton University Press, 1999. See part III, especially Chapter IX